I don't know how reputable people find seranking.com, but according to it, OMAAT traffic is indeed down severely YoY. Looking back 2 years, 2023 average traffic was just above the 100k and he's down 35% from that.

Perhaps people are finding that his content is staling? At some point, he's reviewed it all, one can only do so many international business class + Hyatt reviews, before they start repeating over again.